"P>0.5 [ F s=7&d>x ]"
"x"
1, 2, 3
true, true, false

"P=? [ F<=5 s=7&d>3 ]"
0.46875

"R=? [ F ""done""&d>=x ]"
"x"
1, 2, 3
1.0, Infinity, Infinity